1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 /*
29 * IEEE 802.11 Monitor mode support.
30 */
31 #include "opt_inet.h"
32 #include "opt_wlan.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/mbuf.h>
37 #include <sys/malloc.h>
38 #include <sys/kernel.h>
39
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
42 #include <sys/endian.h>
43 #include <sys/errno.h>
44 #include <sys/proc.h>
45 #include <sys/sysctl.h>
46
47 #include <net/if.h>
48 #include <net/if_var.h>
49 #include <net/if_media.h>
50 #include <net/if_llc.h>
51 #include <net/ethernet.h>
52
53 #include <net/bpf.h>
54
55 #include <net80211/ieee80211_var.h>
56 #include <net80211/ieee80211_monitor.h>
57
58 static void monitor_vattach(struct ieee80211vap *);
59 static int monitor_newstate(struct ieee80211vap *, enum ieee80211_state, int);
60 static int monitor_input(struct ieee80211_node *ni, struct mbuf *m,
61 const struct ieee80211_rx_stats *rxs, int rssi, int nf);
62
63 void
ieee80211_monitor_attach(struct ieee80211com * ic)64 ieee80211_monitor_attach(struct ieee80211com *ic)
65 {
66 ic->ic_vattach[IEEE80211_M_MONITOR] = monitor_vattach;
67 }
68
69 void
ieee80211_monitor_detach(struct ieee80211com * ic)70 ieee80211_monitor_detach(struct ieee80211com *ic)
71 {
72 }
73
74 static void
monitor_vdetach(struct ieee80211vap * vap)75 monitor_vdetach(struct ieee80211vap *vap)
76 {
77 }
78
79 static void
monitor_vattach(struct ieee80211vap * vap)80 monitor_vattach(struct ieee80211vap *vap)
81 {
82 vap->iv_newstate = monitor_newstate;
83 vap->iv_input = monitor_input;
84 vap->iv_opdetach = monitor_vdetach;
85 }
86
87 /*
88 * IEEE80211_M_MONITOR vap state machine handler.
89 */
90 static int
monitor_newstate(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)91 monitor_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
92 {
93 struct ieee80211com *ic = vap->iv_ic;
94 enum ieee80211_state ostate;
95
96 IEEE80211_LOCK_ASSERT(ic);
97
98 ostate = vap->iv_state;
99 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
100 __func__, ieee80211_state_name[ostate],
101 ieee80211_state_name[nstate], arg);
102 vap->iv_state = nstate; /* state transition */
103 if (nstate == IEEE80211_S_RUN) {
104 switch (ostate) {
105 case IEEE80211_S_INIT:
106 ieee80211_create_ibss(vap, ic->ic_curchan);
107 break;
108 default:
109 break;
110 }
111 /*
112 * NB: this shouldn't be here but many people use
113 * monitor mode for raw packets; once we switch
114 * them over to adhoc demo mode remove this.
115 */
116 ieee80211_node_authorize(vap->iv_bss);
117 }
118 return 0;
119 }
120
121 /*
122 * Process a received frame in monitor mode.
123 */
124 static int
monitor_input(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_rx_stats * rxs,int rssi,int nf)125 monitor_input(struct ieee80211_node *ni, struct mbuf *m,
126 const struct ieee80211_rx_stats *rxs, int rssi, int nf)
127 {
128 struct ieee80211vap *vap = ni->ni_vap;
129 struct ifnet *ifp = vap->iv_ifp;
130
131 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
132
133 if (ieee80211_radiotap_active_vap(vap))
134 ieee80211_radiotap_rx(vap, m);
135 m_freem(m);
136 return -1;
137 }
138